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http://hdl.handle.net/2440/122634
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Type: | Journal article |
Title: | Improvement of palladium limit of detection by microwave-assisted laser induced breakdown spectroscopy |
Author: | Al Shuaili, A. Al Hadhrami, A. Wakil, M. Alwahabi, Z. |
Citation: | Spectrochimica Acta Part B, 2019; 159:105666-1-105666-7 |
Publisher: | Elsevier |
Issue Date: | 2019 |
ISSN: | 0584-8547 1873-3565 |
Statement of Responsibility: | Ahlam A. Al Shuaili, Ahlam M. Al Hadhrami, M.A. Wakil, Zeyad T. Alwahabi |
Abstract: | Detecting elements such as heavy metals is important in many industrial processes. The techniques currently used are time consuming and require excessive sample preparation. In this paper, we demonstrate microwave-assisted laser-induced breakdown spectroscopy (MW-LIBS) to detect palladium (Pd) in solid samples at ambient conditions. Microwave radiation was introduced by a near field applicator to couple the microwave radiation with the plasma. The results were a 92–fold enhancement in palladium signal with 8-fold improvement in the limit of detection at laser energy levels below 5 mJ (1250 J/cm² laser pulse fluence). We also investigate the optimum experimental parameters of palladium detection for both laser-induced breakdown spectroscopy (LIBS) and MW-LIBS. The maximum signal to noise ratio improvement was achieved at microwave power of 750 W and laser pulse fluence of 157 J/cm² for Pd I 340.46 nm. Finally, we examine the location of the near field applicator (NFA) with respect to the sample to show that the MW-LIBS signal strength was significantly affected by the vertical position compared to the horizontal. The detection limits of palladium with LIBS and MW-LIBS were 40 ppm and 5 ppm respectively. |
Keywords: | Laser-induced breakdown spectroscopy; microwave assisted; signal enhancement; palladium detection |
Rights: | © 2019 Elsevier B.V. All rights reserved. |
RMID: | 0030133010 |
DOI: | 10.1016/j.sab.2019.105666 |
Appears in Collections: | Chemical Engineering publications |
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